33. MAUROLYCUS.--Walled plain; 150 miles; 14,000 feet. In area equal to about half of Ireland. Floor in full covered with bright streaks. Plate XVI. Seventh day. 58. PICCOLOMINI.--Ring plain; 57 miles; 15,000 feet on E. Fine central mountain. Very rugged neighbourhood. Plate XI. Fifth and sixth days. 63. PITATUS.--58 miles. Wall massive on S., but breached on N. side, facing Mare Nubium. Two clefts in interior shown Plate XV. Ninth day. 78. FRACASTORIUS.--Another partially destroyed formation; 60 miles. Wall breached on N., facing Mare Nectaris. Under low sun traces of wall can be seen. Plate XI. Fifth and sixth days. 80. PETAVIUS.--Fine object; 100 miles; 11,000 feet. Fine central peak 6,000 feet. Great cleft from central mountain to S.E. wall can be seen with 2-inch. Third and fourth days, but best seen on waning moon a day or two after full. 90. GASSENDI.--Walled plain; 55 miles. Wall on N. broken by intrusive ring-plain of Gassendi A. Fine central mountain 4,000 feet. Between thirty and forty clefts in floor, more or less difficult. Plates XII., XIII. Eleventh and twelfth days. 95. CATHERINA; 96. CYRILLUS; 97. THEOPHILUS.--Fine group of three great walled plains. 95. Very irregular; 70 miles; 16,000 feet. Connected by rough valley with 96. 96 has outline approaching a square; walls much terraced, overlapped by 97, and partially ruined on N.E. side. 97 is one of the finest objects on moon; 64 miles; terraced wall, 18,000 feet. Fine central mountain 6,000 feet. Plates XI., XVI. Sixth day. 84. ARZACHEL; 110. ALPHONSUS; 111. PTOLEMÆUS.--Another fine group. 84 is southernmost; 66 miles; 13,000 feet. Fine central mountain. 110. Walled plain; 83 miles; abutting on 111. Wall rises to 7,000 feet. Bright central peak. Three peculiar dark patches on floor, best seen towards full. 111 is largest of three; 115 miles. Many large saucer-shaped hollows on floor under low sun. Area 9,000 square miles. Plate XIII. Eighth and ninth days. 125. GRIMALDI.--Darkest walled plain on moon; 148 miles by 129; area 14,000 square miles; 9,000 feet. Plate XII. Thirteenth and fourteenth days. 131. MESSIER AND MESSIER A.--Two bright craters; 9 miles. Change suspected in relative sizes. From Messier A two straight light rays like comet's tail extend across Mare F[oe]cunditatis. Fourth and fifth days. 147. COPERNICUS.--Grand object; 56 miles; 10,000 to 12,000 feet. Central mountain 2,400 feet. Centre of system of bright rays. On W. a remarkable crater row; good test for definition. Plates XII., XIII. Ninth and tenth days. 150. TRIESNECKER.--Small ring plain; 14 miles. Terraced wall 5,000 feet. Remarkable cleft-system on W. Rather delicate for small telescopes. Plate XIII. Seventh and eighth days.